Calling device for electrical exchange systems.



Agli. DYSON. CALLING DEVISE FOR ELECTRICAL EXCHANGE SYSTEMS. APPLA'IUN TLD FEB. 1G. 100G.

1,000,902, Patented Aug. 15,1911.

E SHEETS -SHEET 1.

` A. H. DYSON. CALLING DEVICE POR ELECTRICAL EXCHANGE SYSTEMS.

APPLICATION FILED 11113.16, 1906.

1,000,902. Patented Aug. 15. 1911 2 SHEETS-SHEET 2,

. essentially an .ALFRED H. DYSON,` 0F CHICAGO, ILLINOI xELLocG swrrcnnoann a SUPPLY eo S, ASSIGNOR, BY MESNE ASSIGNMENTS, T0

MPANY, A CORPORATIONCF ILLINOIS.

CALLING DEVICE FOB ELECTRICAL EXCHANGE SYSTEMS.

specification of Letters raient. Patented Aug, 15, 1911.

Application led February 16, 1906. Serial No. 301,472.

To all whom tt may concern.'

Be it known that I, ALFRED H. DYSON, residing in Chicago, county of' Cook, and State of Illinois, have invented new and useful Improvements in Electrical Exchange Systems, following 'is'a specification.

My invention` relates to calling devices for electrical exchange systemsand has'for its object the provision of an Vimprovedstruc-A ture for transmitting signaling currents. to exchange mechanisms. y

The calling device of my.

electro-mechanical numberrecording machine, the 'numbers being recorded by means of electro-magnetic switch ing devices at the exchange.

In recorders in general it of- `which the has been found i convenient to employ a movable member above referred' to l ber and .each time the device is operated theV provided with., adjacent finger holds, one for each number tobe recorded, associated with,

which is a stopping device to limit the movement of the said member according to the finger hold selected. .In the employment of a device of this character rapidity of operation is of the essence, and my invention has for its more particular object, the arrangement of a structure giving a very rapid operation.

The known recorders of the character have a single stopping` device immovably related to the movable memselected finger hold .must be brought around to this point.` The finger holds must be sufficiently large to readily admit ofa firm grasp by the finger and must be pro .erly' spaced so as not tov be too crowded; ence the number'- whose finger holdj "lswfrt'hest from the stopping .poi t requires considerable movement of the device to record it.

Briefly stated, my invention, tothe end of reducing the extent of movement. of the member,provide's for a plurality of stopping places and this is accomplished by a `second movable member linked to that containing the finger holds by. 'a suitable arrangement of gears and racks, so as to come toward the finger and meet it when the de! am thereby enabled to reduce the required Vlnovementof the linger vice is'y operated. I

Calling Devices for invention' isA tain number,

for'exchange work,"

for the recording of each number by approximately one half.

r1 he exchange systems in connection with which my invention may be used are provided-with metallic circuit lines and the exchange switching devices are operated responsive to sets of current impulses trans'- mitted over the two line limbsseparately by connecting 'them with a third independent conductor. The usual sequence of current impulses consists of a plurality of impulses sent over a limb P to record a cer- I and a single impulse sent over the other limb S, after the transmission of the last impulse of the plurality mentioned,

lfor the purpose of'setting in train ofmotion-4 1 auxiliary apparatus to prepare for the trans- Such exchange mission of the next number. systems form no part of my present lnvention and will therefore not be 'particularly 'described in this application, as Vseveral vaxylng forms. thereof are 1nwide commercial use in the United States.

Referring to the drawings, in Figure' 1 I illustrate a'top view of the preferred embodiment .of myy invention. In Fig. .2 'I

show a side view 'thereof on section 'line -m of Fig. 1. In Fig.- 3, I show a front elevation thereof having a portiofn of the finger dial cut away. In Fig. 4., I illustrate a rear elevation of the device, the operating springs thereof being connected to a known form of telephone substation circuits. In Fig. 5 I illustrate a form of governor employed in connection' withthe device. is a sectional view thereof on line y--y of Fig. 5.l Fig.' 7.illustrates a friction member for said governor. V

Referring .first to Figs. 1 and 3,1 isthe mainshaft journaled` to the frame plates F and F. Rigidly attached-to the front end of shaft 1 by screw 12* is the dial 12 4rovid'ed with 10 adjacent linger holds.` astened to the shaft 1 is gear 15l meshing with rack I5, the two screws to a second rack 14 out in the lever arm 14, pivoted at 14. Loosely turning lon `the' .shaft `1 and 14h is a second gear'13 to which is fastened rl lever 13.. The moving of the iin r latter being fastened by meshing with rack dia 12 inthe direction of the arrowA.; ig.

--bar 23* attached to gear 22 (Fig. 6), When 3)'. carrying with it the shaft 1 and gear 15a' operates by racks 15 and 14b totransmit inotion to lever 13 in the direction indicated by arrow B so that 13 moves substantially a distance equal to that moved by the finger, to meet it in the selected'hold. Attached to shaft 1 and frame F is spring 1 causing a reverse clockwise movementoi' shaft 1 after dial 12 has been rotated and released. Shaft 1 also carries rigidly 'attached to it the lever 17 whose left extremity carries an arm 17 arranged to contact with spring 8 and Whose right extremity carries the stud 17"i to which are ,pivoted thetwo pawls 17 and 176.l These paivls are held by their associated springs in engagement respectively with the impulse wheel 16 and the gear-Wheel 18, loosely mounted on shaft 1, the arrangement of both pavvls with respect to the teeth of their Wheels being similar' to the rela-tion of pawl 17h to wheel 1G as disclosed in Fig. 2, namely such that when by the movement of shaft 1, lever 17 is clockwise rotated, the pawls 17b and 17c slip over the teeth Without causing movement of the wheels t-hemselves, whereas ,u on a reverse clockwise movement of the s aft they engage the gear 'teeth and cause a corresponding movement of the said wheels 16 and 18. Impulse wheel 16 has in mechanical contact with it a stili' spring 16a (Fig. 2) connected to spring p;

on a reverse clockwise movement of Wheel 16, spring 16a rides over successive teeth of the wheel causing spring p to engage contact plate 11, once for each'tfooth ridden over. The lug 17d attached tothe lever 17, passes', on clockwise'movement of the lever, past the projection s of the spring s on the under side thereof, while on the return of the lever to its normal position'shown, `lug 17d passes on the outer side of 8', thereby pressing springs to-engage the contact plate 11. The gear 18 meshes with the small gear 1'- (Fig. 3) attached to the auxiliary shaft 20,. which is journaled to plates F and F. Fastencd to shaft 2O isa large gear 21 meshl ing with .the gear 22 which With the Sattached governor 23 is looselymountedf on shaft 1. This arrangement is to link the lever 17 by its pawl 17', and consequently/ the shaft, with the governor and its friction member so as to secure an even speed of impulse wheel 16.

In Figs. 5 and 6 the governor is vvshown consisting of two segments 24 and 25 pivoted at 24b and .25*Arespectively to the cross bar 23which fits loosely on the shaft. The slots 24 and 25, cut in segments 24 and I25 receive the circular frictio'n member 2G which fastens rigidly to frame F. Cross rotated on movement of the ear throws the segments 24 and 25 outwardly about pivots 24'a'nd 25" toclutch .the friction member 26 The hook lever 10 is pivotedto frame plates F and F asv shown in Figs. 1 and 4 and carries a pawl 10r (Figs. 1 and 3) adapted Ito engage the teeth of gear 18, operating with respect thereto in a manner similar to that of pawl 17, whereby the descent of the hook lever upon the replacing of the receiver is brought under control of the governor 23. Screwed lto hook lever 10 are two lugs 10g and 10h (Fig. l) arranged on upward movement of the hook lever to pass inside of their associated extensions of springs 79 and s, while on a subsequent downward stroke of the lever they pass on the outer sides of said extensions to press the said springs inwardly to simultaneously contact with plate 11. When lugs 10E and 10h pass beyond the associated extensions of springs 7J and s, the said springs by their tension disengage contact plate 11.

Referring now to Fig. 4, P and S are the two limbs of the telephone line extending to the substation, and being normally united through the customary call bell and condenser via contact between springs 8 and,7., Limb I is also connected to spring 4 whose associated contact spring 5 is connected through transmitter T and the primary winding of the induction coil to limb S. Connected to limb P is spring 2 mechani. cally boynd to lever 2, and in electrical associatlon with spring 3 extending to spring 'p. Limb S extends to spring s and, through the windings of the induction coil and thereceiver, to spring 6, which when engaged by its associated spring 7 ,connects the receiver with'thecondenser in talking relation with the, line. Associated with contact plate 11 and adapted lto be placed in electrical connection therewithxis the spring 9 which isconnected to a third conductor which may be earth, as indicated at G. The hook lever 10 is shown in' its normalposition as if the receiver were supported 'by it. ltsspring l a raises the lever upward upon the removal of the receiver, the bushing 10d of insulating'material then removing tension l:trom springs 5, 7 and 9,connected mechanicallY by the insulating studs shown, Where.

by the'said springs move to their alternate positions vengaging springs 4, Gand contact plate 11 respectively. A second bushing 10b ilo fastened to lever 10 engages extension 10c of I spring 3 as .the lever 10 completes its upward movement, to open contact 2 3. Fastened pivotally to lever 10 is the pawl 10e, normally held by its spring in interlocking relation with an arm 1n attached to shaft 1 Whose bushing lh normally holds spring 4 in the osition shown. The pawl 10E locks the shag from rotation until thereceiver is removed, and being mounted on lever 10 so as .to have a relatively slight xnovement'as compared with bushing 10d. Contact 4 5 will on the removal of the receiver be closed before the shaft 1 will be rendered movable by which hthe disengagement `of pawl 10 from arm Vment of the calling device of-my invention,

its method of use will be explained in the following narrative of operation.

The switching operations require to be executed by the calling device are; that on the removal ofthe receiver, limbs P and S 'shall be conductively united before the fin.

ger dial 12 shall be operated; that contact between limb -P and plate 11 4shall be made and broken a number of times' depending on the selected finger hold' of dial 12; that contact shall be made and broken a single'time between limb S and plate 11 after the last connection between P and 11; that the condllctively united condition oflimbs P and S, interrupted durin the operation of dial 12, shall bc restabhshed on the return of the dial to normal; and that on the replacing 'of the receiver, springs p and s shall simultaneously be for a moment connected to contact plate 11. A calling subscriber' first removes his receiver from hook lever 10, which moves upward whereupon spring 9 connects -third conductor G to plate 11,. spring 7 disconnects the condenser from the call bell and connects it with tlie'receiver circuit,'and spring 5 conductively unites limbs P andV S through contact 4 5 and transmitter T. Immediately thereafter, as lever 10 ascends pawl 10e unlocks shaft 1 rendering it rotatable b finger dial 12,v and contact 2.3 isopened isconnecting spring p and limb P. [supposing the `subscriber desires to record the number 5, he inserts his finger infinger hold 55 of dia-l 12, the fifth hold from below, and rotates, the dial (which carries with it shaft 1) in the direction of arrow A, until finger lever 13, moved in the direction of arrow B, byits described ear combination, meets his finger. Lever 1 is thereby moved in a clockwise rotary direction `until-its awl 17h has passed over eight teeth of impu sewheel 16, Vthree more than the units 4of the number to be recorded. Arm 1l with its calm 1c (Figa)l turns with the dial and shaft asindicated by arrow D, bushin 1" removing tension from spring 4 isengages spring 5 to disunite limbs P and S which remain disunited until the shaft reaches normal.' Cam 1c as pawl 17'J passes over the fourth tooth of impulse wheel16, lifts with its raised portion spring 2I to place lspring 2 4in engagement with i' spring 3, whereby p andP are connected.'

The subscriber now'r removes his finger from hold55` and the shaft 1- and dial 12, by the Y `influence of spring '1 are rotated in a re verse clockwise direction. Lever 17 and its pawls 17b and 17c are carried with the shaft, pawl 17 engaging the last tooth over which 1t was moved as before described,'and moving impulse wheel 16, which by its spring 16l connected to sprin spring p to be connectev to contact plate 1.1, eight separate times. Limb P ofthe line is thereby connected 4through contacts 2 3, p-vll and 11-9 to the third conductor G fiver separate times and -would be so connected'eight times were it not for the fact that, just before the sixth closing of contact p-11, cam 1 reaches a point where it allows contact 2-3 to be o ned, thereby disconnecting p and P. A ter 2- 3 is opened and simultaneously wit-l1 the seventh contact between p and 11, arm 17d (Figs. 1` and 2) passes outside of s ring s pressing it in- Warydly to engage pljate 11 whereby limb S p, causes the said is momentarily and for a single time connected to third conductor G through contacts s--11 and 119. The return movement of the shaft caused by the eighth tooth passed over bypawl 17", does not cause .the connection of 'either-line limb to the third conductor, but closes contact 4-5 establishing-the talking circuit and'brings arm 1 against stop a, which arrests the movement of the shaft-1. For any number to be transmitted, the arrangementy is such that pawl 17h will. pass over three teeth of wheel 16 more than the digits-of the number so that after the last impulse over limb P, one tooth causes movement toV open contact 2--3, an-

other to close and open contact .s--11, the

`third to bring the dial to normal and close contact 4l1-5. Additionall numbers, one after `the other, may be recorded by successive similar operatlons of dial 12 to complete in the unual mannerby means of'the.

central office apparatus connection from the calling line to the desired called line. Upon the replacing of ,the receiver on` hook lever 10" lugs 10g and 1'()h (Fig. l), simultaneously connect springs p and s to oontactfplate 11 and (contact 3- -2 being closed as lever 10 begins to descend) limbsP and S are simultaneously connected to the third conductor G which' in accordance with the known methods of operation will cause the lines to be disconnected. As the lever reaches nor mal, springs 5, 7 and 9 assume their normal positions shown, under the ,influence of ushing 10", the call bell and condenser being thereby placed in bridge of'limb's P before described.

I claim 1. A call' device comprisin a movable member provided with adjacent nger holds, a second movable member linked with the first, said members being arranged to limit lso the movement each of the other according to selected finger' holds and mechanism actuated responsive to movements of said members to transmit current. impulses corresponding to the selected holds.

2. A calling device comprising a lever provided with adjacent finger holds, a. second levertraveling-in a direction vopposite to the first on movement thereof to limit the travel .of the first and an impulse transmitter actuable arm actuated on movement ofthe lever for stopping the lever in a plurality of positions according to t-he selected holds.

A calling device comprising a shaft, an impulse transmitter operated responsive to thc actuation thereof, a movable member provided with adjacent finger holds for actuating said shaft.,v a second movable member` and a. gear linking saidl second member with the shaft adapted on movement of the first member to cause an opposed movement of thelsecond to limit the movement of the first.

. G. In combination in a calling device for an electrical exchange, a pair of line limbs, a'

movable finger member, a cooperating movable stop, an impulse transmitter actuated on movement thereof adapted to connect the line limbs in predetermined fashion with a. third conductor, a hook lever n rmally intei-locking with said finger mem er to prevent movement thcreof, means uniting said line limbs in metallic circnitactuated on the removal of the receiver from the hook lever, and mechanism controlled by the hook lever for thereafter unlocking said finger member.

7. A calling device comprising a member provided with adjacent finger-holds, a stop movable with said member for limiting the movement of said member` and an impulse transmitter actuated on the movement of said member, said stop having a movement different in direction from that' of said member.

8. .A calling device comprising impulse transmitter mechanism, a stop movable in response to the operation of said mechanism and means cooperating with said stop to determine the numbers of impulses transmitted on actuation of said device.

9. A calling device comprising manually actuated impulse mechanism, a stop. adapted to be adjusted to a plurality of positions in response to the operations of said mecha-- nism, and coperating means for said stop.

l0. A calling'device including an impulse transmitter, and an adjustable stop movable in response to the operation of said device to control'the extent of its operation.

l1. A calling device comprising a movable. member having a plurality of adjacent finger holds, a second oppositely movable member` for engaging the finger to limit the movement of said first member, and mechanism for transmitting impulses corresponding to' sa'id finger holds.

12. A calling device comprising a movable dial pivoted at its center and having a circular row of finger holds near its peripher f, a finger` lever pivoted inward from said finger holds. and being adapted to move oppositely to said dial-and operative to engage the finger to limit the movement of saiddial, and mechanism for transmitting impulses corresponding to said finger holds.

In witness whereof, I have hereunto subscribed my name this 13th day of February 1906.

ALFRED H. DYSON.

Witnesses Gr. E. MUELLER, Hf C. OLMSTEOD.

Copies of this patent may be obtained for ve cents each, by addressing the Commissioner of Patents.

' Washington, D. C. 

